Insulator for the suspension of live cables for electric railways



Feb. 4. 1925. 1,527,888

A.UNDE

INSULATOR FOR THE SUSPENSION OF LIVE CABLES FOR ELECTRIC RAILWAYS Filed Nov. '6, 1924 lnvchtor= emplo ed "but these parts grip one on the zen of the Reppblic of Germany,

\ of the necessity Patented Feb.24,1925.

- UNITED STATES 1,527,888 PATENT OFFICE.

auoos'r LINDE, or moxnnsnnc, GERMANY.

- IHSULLTOB FOR THE SUSPEKBIQN OI LITIIVE CABLES-FOR mm RAILWAYB.

Application filed November 8; 1924. Serial No. 748,087.

To all whom it may concern:

Be it known that I, Ations'r Lmnn, a citiresidingtat Muckenberg, ieder-Lausit-z, Kreis Liebenwerda, Germany, have invented certain new and useful Improvements in Insulators for the Suspension of Live Cables for Electric Railways, of which the following is a specification.

In the known arrangements for the suspension of the live cable for electric trams or railways, which-consist of an iron casing insulator comprising a porcelain insulating member and a bolt for holding the cable, these parts are either cemented orplastered together and this leads to unsatisfactory conditions, as cement and plaster are unstable when exposed to vibrations and the influence of the weather and line breakages can easily take place with all their serious consequences. Consequently the parts of the insulator are not interchangeable, or only with difficulty, and this is a defect in view of keeping them in good condition.

Now the form of insulator according to this invention eliminates all these disadvan-;

tages. The invention consists in the fact that in assembling the insulating member and its casing no cementingor plastering is other y means of ridges and grooves or a .bead and corresponding groove, r both, and

the casing is formed in two pa adapted to be bolted together whereby the insulator can be clamped fast and easily exchanged. The bolt for fastenin the live cable passes right through the insu ator, rests with its head in a. depression therein, which is closed by means of a porcelain plate, or else the insulator is entirely closed at the top and abolt with an elliptical head is inserted into a recess in the insulatin member and turned within this recess, the ttom of the recess being enlar for this purpose.

The insu ator of this invention is shown in the accompan ing drawings in which Figure 1 is a nt elevation of the insulator., Y Figure 2 a lateral elevation of the same, with one part of the casin removed.

Figure 3 is a lateral eova-tion of same with a modified form of cable carrying bolt. Figure 4 is a cross section on line AB of Figure 1.

Figure 5' is a cross section on line C'-D of Figure 3. 8

Figure 6 is'a plan view of the insulator shown in Figure 3,'and

Figures attachment for the casing and with a part thereof removed.

The insulator a is massively constructed and at the bottom projects considerably from its setting, so as to withstand all 05 'nected with the plate (I, while the other half a is connected by means of lugs and studs 7: 80

with the part b and can be removed when it is desired to test or exchange the insulator a. In order that the insulator a may not be loosened from its casing 6,0 when subjected to a strong ull or pressure, it is gripped by 85 means of ii ges Z or the bead Z or both,'the casing b, 0 being rovided with corresponding depressions Z 3 (Figure 8). Gement-in'g or lastering is entirely obviated with this met 0d of attachment. The porcelain insuno lator 0 lies directly u 11 its iron casing b, c and can, after loosening a stud k, be turned therein. The underneath part g of the insulator a is concave so as to keep water away from the bolt m for holding the wire.

The bolt m passes loosely through the aperture m, fits deeply with its head n into an hexagonal recess n in the insulator a. and is screwed tightl' on to the insulator by means of a nut 0.

far as to enable a travellin wire clip to be fastened to it, or it is. provided with a further nut (Figure 8) in order that the device may serve as an insulator sup ort. At the top above the head a. of the be t m a attachment r, "adapted to pro ect into the 110 7 and 8 show two other forms of plate d, which towards ally it can be rovided also ebolt m projects so me lain plate 1; (Figure 2) is inserted into a corres ondingly shaped recess n (Fi re 2). rdm this construction, it willlbe c ear that no cement is required to retain the bolt' min the insulator a. Moreover, leakage of current to the s spending or supporting means will be effectively eliminated.

Instead of the bolt muse can also be made of a-readily interchangeable bolt 8 '(Figures 3 to 5), completely insulated at the top'by means of the part 25 of the modified form of insulator (1., whereby the insulation is improved and simplified. The bolt 8 has an oval preferably ellipsoidal head u, only projecting attwo opposite sides, which is inserted from below through an ovalaperture a (Figure 6) in the insulator a (Figure 6) until it is in the space whereupon the .bolt

is turned through an angle of 90 degrees and the head at lies in the bearing w. This bolt 8, u can be exchanged without removing the insulator a from its casing, as moreover it is neither cemented nor plastered in position. What I claim and desire to secure by Letters Patent of the United States, is

1. An insulator for the suspension of live cables, comprising a two part casing,

me'ans for detachably securing the parts of the casing together, an insulating member mounted within said casing, groove and ridge connections between the casing and insulatingmember to retainthe insulating member within the casin the said insulating member being provi ed with a central longitudinal bore and a countersunk recess in the end of the insulatin member concentric with said here, a'ca le carrying bolt mounted within the bore, means for closing one end of: said casing, and an insulating member, interposed between the bolt and the the said closing means and seated within the countersunkrecess. I Y I 2. An insulator for the suspension of live cables, comprising a "two part casing, means 'for detachably securing the parts of said casing together, a cover for one end of said casing, an insulating member mounted within said casing, a cable carrying bolt passing through said insulating member and projecting beyond .one end thereof, the end of the insulating member adjacent the casing cover being provided with a countersunk portion and an insulating member between bolt and .the cover adapted to seat within the countersunk portion of the insulator.-

"3. An for siispending live 6150 .tric cables,"comprising a two part casing,

means for detachably securing saidparts together, a cover for one'end of said casing,.

an insulating member mounted within said casing, ridge and oove connections between the casing an insulating member to prevent relative longitudinal movement therebetween, the insulating{ member being provided with a countersun "portion in the end thereof adjacent the cover, and a central reduced bore communicating with the said countersunk portion, a cable carrying bolt passing through said bore and pro'ecting sulatingmember for retaining the insulating member within the casing, thesaid in sulating member being provided with arecess in the end adjacent said cover, and a bore connecting sa d recess w1th the other.

end of theinsulating member, the said bore being of smaller diameter than the recess a cable carrying 'bolt mounted within said bore, and an insulating plate between the bolt and the cover of the casing adapted to sit within the'recess.

5. An insulator for suspending live electric cables, comprising a two part casing, means for detachably securing said parts together, acover for closing one end of said casing secured to one of said parts, means on said cover for attaching the insulator to a support, an insulating member mounted within said casing, connections between said insulating member and the casing to retain the insulating member within. said casing, the sad lnsulatlng member being provided in the end adjacent the cover with an en-' larged'recess and a restricted recess communicating with said first mentioned recess,

and a central longitudinal bore between said second named recess and the other end of the insulating member, a cable carr'yingliolt adapted to fit within said bore,,an enlarged head on said bolt adapted to sit within the second named recess, a nut on the outer end of said bolt, and an insulating plate between the head of said [bolt and the cover of the casing, the said insulating plate comprising an enlarged portion adapted to sit within the first named recess and a: restricted portion adapted to project into the second named recess.

In testimony whereof l afiix my signature I j in presence of two witnesses.

' AUGUST LINDE. -Witnesses: v WLED. Emma;

ROY 0. Fox. 

